Merge pull request #1 from smathot/master

Some restructuring for debian packaging
Updated spec files

Updated spec files for pyinstaller
Bugfix + datatype correction

- Corrected for KeyError when writing xls(x) files if one file misses a
column compared to the others
- Data is now written to xls(x) files in correct datatype, instead of
always as string
Fixed invalid resource folder

Fixed invalid resource folder indication for packaged versions, in which
the libdatamerger folder is not created apparently
fixed command line functionality
Updated version number
Merge pull request #1 from dschreij/master

Fixed numerous bugs, mainly in CLI operation